How difficult would it be to make the “create new topic by email” feature examine the Delivered-To field as well as the To field? I have a situation where I’m trying to manage a transition from a Mailman list and this feature would be very useful for me.
So I ended up implementing this myself, by polyfilling Email::Receiver.process()
It’s pretty hacky and quite specific to my use case so I don’t believe it’s worth sharing - as well as looking at Delivered-To and X-Delivered-To it tidies up the email subject line and posts to topics of the same name if they already exist.